Answer

Fact (2) can be alternatively stated that "either Mad Ade or Thorny Kator or Bill Sticker must have Kebab and napalm chilli sauce".

From Fact (3), it can be inferred that either Mad Ade or Thorny Kator must have Kebab and napalm chilli sauce.

Now, from Fact (1), it is apparent that Bill Sticker too must have Kebab and napalm chilli sauce. But according to Fact (4), Thorny Kator cannot have Kebab and napalm chilli sauce when Bill Sticker does.